3.5 Symbiosis

Question 1

symbiosis

Answer 1

a co-evolved intimate relationship between two members of different species

Question 2

two types of symbiotic relationship

Answer 2

• parisitism
• mutualism

Question 3

parisitism

Answer 3

where the parasite benefits at the expense of the host

Question 4

mutualism

Answer 4

where both species benefit from the relationship (an interdependent relationship)

Question 5

what do parasites benefit in terms of, and the host is harmed by the loss of?

Answer 5

energy or nutrients

Question 6

why can’t many parasites survive out of contact with a host?

Answer 6

they have a limited metabolism

Question 7

ways which parasites are transmitted (3)

Answer 7

• direct contact
• resistant stages
• vectors

Question 8

direct contact

Answer 8

direct physical contact allows the parasite to pass from one host to another

Question 9

resistant stages

Answer 9

some parasites are able to survive adverse conditions until they come into contact with a new host

Question 10

vectors

Answer 10

parasites can be passed through a vector such as an insect from on host to another

Question 11

intermediate hosts

Answer 11

some parasitic life cycles involve involve intermediate hosts to allow them to complete their life cycle